Most Saturday nights, Bill Hader effortlessly fills your Stefon, Vinny and impressions fix (65 so far in six seasons) on 'Saturday Night Live.' But this summer, his Sunday nights will be spent hosting 'TCM Essentials Jr.' on Turner Classic Movies, introducing his favorite classic films that are great for parents to watch with their kids. The father of one spoke with PopEater about old movies, the art of comedy and 'SNL,' in which he lavishes praise on the surprisingly funny Brian Williams and admits he has a zen attitude about getting sketches on the highly competitive show.

What's the definition of comedy. Is it what Woody Allen says, tragedy plus time?
(Laughs) I don't know what the definition of comedy is. I really don't. I don't know what the definition of a lot of things are, though that sounds like a good definition.

Which celebrity guest on 'SNL' has surprised you the most in a good way?
I knew Brian Williams was funny because I met him and it was like, 'Wow, Brian Williams is really funny and silly,' but when he came on the show he did characters like a Brooklyn fire fighter and he was really great.